Palapeli is a single-player jigsaw puzzle game.
Unlike other games in that genre, you are not limited to aligning pieces on imaginary grids.
The pieces are freely moveable.
Also, Palapeli features real persistency, i.e. everything you do is saved on your disk immediately.
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.